fix: disable Faiss Python bindings to avoid CMake Python finding issues

- Set FAISS_ENABLE_PYTHON to OFF since we use our own Cython bindings
- This avoids the CMake Python finding issues in manylinux environments
- Simplify CMakeLists.txt by removing unnecessary Python finding logic
- Keep swig installation for other potential uses

pyproject.toml

@@ -84,6 +84,3 @@ before-all = "brew install boost zeromq openblas cmake libomp"
 # 环境变量配置
 [tool.cibuildwheel.environment]
 CMAKE_BUILD_PARALLEL_LEVEL = "8"
-
-# 构建前安装必要的Python包
-before-build = "pip install numpy"